|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Bivalvia - Arcida - Glycymerididae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|B. Kensley and J. Pether 1986||All material in poor condition, with external surfaces exfoliating, and shape frequently deformed. Shell slightly inequilateral, posterior margin slightly more pointed than anterior margin; slightly wider than high. Sculpture of about 40 radiating, apparently flattened ribs, becoming obsolete in anterior and posterior part of shell. Ventral margin faintly crenulate in external view, internally more strongly crenulate. Anterior and posterior adductor muscle scars· situated on faint ledge. Hinge area with teeth discontinuous below umbo, divided into two groups, each of 7-9 teeth.|